July 2012 - Report and Summary

The month of July 2012 was warmer than normal, but saw near normal precipitation. ompared with July 2011, the month was 4.8 deg. Cooler, and 1.98 inches wetter. July 2011, in the midst of the 2011 heat wave, was the warmest July on record. Year-to-date rainfall was 10.59 inches greater in 2012 than in 2011 through month's end, and was near normal. A series of upper air storm systems kept temperatures relatively mild during the first half of the month with ample rainfall. The latter half of the month was dominated by upper air high pressure, with hot temperatures and little rainfall. The thirty-day outlook had called for above normal temperatures and below normal precipitation.

A storm system exited on the 1st, followed by building high pressure. This caused temperatures to go slightly above normal through the 7th, and virtually suppressed any rainfall. On the 8th, a slow-moving upper air system, reinforced a couple of times, took up a position over the Southern United States. This brought below normal temperatures and frequent mainly afternoon and evening showers and thunderstorms until it finally moved westward out of range on the 16th.

Temperatures warmed again between the 17th and 21stt as upper air high pressure returned. Another Easterly wave crossed between the 21st and 23rd, returning afternoon showers and thunderstorms to the region, with severe weather on the afternoon of the 21st.

Upper air high pressure built back in on the 24th with warming and an end to showers. A weak cold front brought thunderstorms to the northeastern counties on the morning of the 27th, and a slight weakening of the upper air high. It re-built on the 28th, with hot temperatures and dry conditions through month's end. The temperature reached or exceeded 100 deg. On each of the month's last four days.

KEY TO SYMBOLS:

A = HAIL

B = BLOWING

D = DUST

F = FOG

H = HAZE

IP = SLEET

K = SMOKE

L = DRIZZLE

R = RAIN

S = SNOW

T = THUNDERSTORM

Z = GREENWICH MEAN TIME

ZL = FREEZING DRIZZLE

ZR = FREEZING RAIN

- = LIGHT

+ = HEAVY

The reporting period for temperatures and phenomenon on each day is for the twenty-four hours ending at midnight hours GMT--6 p.m. CST and 7 p.m. CDT. The reporting period for precipitation is for the twenty-four hours ending at noon GMT--6 a.m. CST and 7 a.m. CDT. All times are given using the twenty-four hour clock, and are expressed in Greenwich Mean Time.

Observations are from NWS Station 41/9207/4 in Tyler, Texas. The term "normal" refers to averages from the standard climatic period 1971-2000.

July 2012

MX MN OBS PCPN REMARKS

02 89 72 84 tr.

03 92 76 88 H

04 94 73 93 F, H

05 95 73 93

06 97 75 95

07 95 71 83 0.40 T, PCPN 0200-0300 DAYTIME HIGH 92

08 91 73 84 0.06 T, F, H, PCPN 1900-2000, 2200-2300

09 90 74 75 0.01 T, F, H, PCPN 2100-2200

10 88 71 85 0.19 T, F, +F, PCPN 0200-0400

11 87 73 77 1.06 T, F, H, PCPN 0100-0200, 2100-2200

12 86 72 75 0.39 T, F, H, PCPN 1500-1600, 2200-2300

13 85 71 84 F

14 88 70 81

15 87 68 84

16 91 71 86 F

17 94 72 92

18 95 73 94

19 95 76 94

20 100 78 97

21 103 74 74 0.26 T, PCPN 2300-2400, MORNING LOW 79

22 94 72 92

23 92 74 85 0.02 F,T PCPN 2200-2300, DAYTIME HIGH 90

24 95 73 92 F

25 96 76 92

26 97 76 93

27 93 76 91 H, DAYTIME HIGH 92

28 100 75 97

29 103 79 99

30 101 78 96

31 101 75 97

July 2012, RECORDS AND SUMMARY:

21ST SEVERE THUNDERSTORM WITH TREE-LIMB DAMAGE 2340Z;

HIGHEST TEMPERATURE 103 ON THE 21ST AND 29TH,

LOWEST TEMPERATURE 68 ON THE 15TH,

AVERAGE MAXIMUM 93.6 F.,

AVERAGE MINIMUM 73.6 F.,

AVERAGE TEMPERATURE 83.6 F.,

1.5 DEG. WARMER THAN NORMAL.

0 HEATING DEGREE DAYS,

0 PERCENT OF NORMAL HEATING DEGREE DAYS.

598 COOLING DEGREE DAYS,

108.5 PERCENT OF NORMAL COOLING DEGREE-DAYS;

TOTAL PRECIPITATION 2.95 IN.,

0.20 IN. GREATER THAN MONTHLY NORMAL.

107.3 PERCENT OF NORMAL MONTHLY PRECIPITATION.

YEAR-TO-DATE PRECIPITATION 26.14 IN.,

1.01 IN. LESS THAN NORMAL YEAR-TO-DATE PRECIPITATION,

96.3 PERCENT OF NORMAL YEAR-TO-DATE PRECIPITATION;

9 DAYS ON WHICH THUNDERSTORMS OCCURRED;

9 DAYS ON WHICH MEASURABLE PRECIPITATION OCCURRED;

2 DAYS WITH GREATER THAN 0.50 IN. PRECIPITATION,

1 DAYS WITH GREATER THAN 1.00 IN. PRECIPITATION;

GREATEST TWENTY-FOUR HOUR PRECIPITATION 1.06 ON THE 11TH;

13 DAYS ON WHICH THE VISIBILITY WAS RESTRICTED TO BETWEEN « AND 6

MILES BY FOG, SMOKE, OR HAZE;

1 DAYS ON WHICH THE VISIBILITY WAS RESTRICTED TO 1/4 MILE OR LESS BY FOG;

0 DAYS ON WHICH THE VISIBILITY WAS RESTRICTED BY DUST OR BLOWING DUST;